I just wish they would explore these themes in the games more though the narrative has such great potential and they just seem to waste it to try and fit the story into generic military dicks 101
The best parts of Killzone 3's story was definitely the conflict between the helghan political factions striving for control, it felt like a well done political thriller and could have been so much more if they explored it more and expanded it instead of all the other lame shit.
Heck my favourite moment on Killzone 2 is when Sev and Rico are on the train and Rico puts a gun up on a Helghast and he begs him not to kill him as he's just an engineer and a civillian not a soldier. They should focus more on aspects like that.